- Loads data from API (https://codingstartup.com/ws2019/supermarket/api.php) with Ajax
- Layout structure as attached
- Filter items by categories (via category key from API)
- Add items to cart (no need to handle item quantity)
- Items could be removed from the cart
- When clicked "Confirm" button, show an alert message "There are totally x items in the cart, $xx in total."
- Desktop version only